The Microsoft Windows SDK is a set of tools, code samples, documentation, compilers, headers, and libraries that developers can use to create applications that run on Microsoft Windows operating systems. The Windows SDK combines two formerly separate SDKs

What OS platforms does the Windows SDK for Windows Server 2008 and .NET Framework 3.5 target?

The Windows SDK for Windows Server 2008 and .NET Framework 3.5 provides prerelease components designed to help you develop Windows applications using both native (Win32) and managed (.NET Framework) technologies, targeting the following Operating Systems. To use this SDK, you must also be building on one of the following supported Operating Systems: